Found this harness on Year One and Classics sites. Says it's for a 65 A body. But the connections look just like the connections needed for the back of my tach. So I assume it will work?
the 65 and 66 tach are way different than your 1971. I wouldn’t buy that harness. Like 72BluNBlu said it would be super simple to make your own. It’s 2 wires.
